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from mod_pywebsocket import msgutil


def web_socket_do_extra_handshake(request):
    # Exact number of headers that will fit in 256KB. Above 256KB an
    # ERR_RESPONSE_HEADERS_TOO_BIG error is triggered instead.

    name = 'Set-Cookie'
    common_length = len(name + ': ' + '\r\n')

    i = 0
    total_length = 0
    while True:
        value = 'ws-%d=1' % i

        total_length += common_length + len(value)
        # Subtract 1KB to make sure we have space for the other headers.
        if total_length >= 256 * 1024 - 1024:
            break

        request.extra_headers.append((name, value))
        i += 1


def web_socket_transfer_data(request):
    pass
